The razor-thin device runs on Windows Mobile 6.0 and offers dual stereo-quality speakers, supports eight audio formats as well as image (JPEG, GIF87a,
GIF89a) and video formats, and PIM functionality with Picture Caller ID.
The most popular way of animating pictures is client-side animation using the
GIF89a graphic file format.
McCormack and Jones add more items to that list - HTML, HTTP, SMTP, POP, JPEG, inline images, image maps, MPEG video,
GIF89a animation, VRML, and JavaScript.
Animations written in Java quickly disappeared when everyone realized that browsers already supported the
GIF89a format (good thing too).
The "Header" block tells your browser what type of gif file it is seeing - typically
gif89a, the gif format that allows for transparent colors.